Arithmetic and control unit



FIG. 1 is a perspective view of front, top and right side of an arithmetic and control unit showing my new design;

FIG. 2 is a perspective view of rear, top and left side thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The portions of the article in broken lines are shown for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an arithmetic and control unit, as shown and described. 